I watched
Treasure Island not too long ago. Cooper and Wallace Beery had a real chemistry together (that was their second and last movie pairing, after
The Champ). It's a credit to Cooper that he was more than a match for Beery, who was, at the time, one of the biggest stars in Hollywood (and the highest paid actor at MGM -- he had that in his contract). That said, Cooper wasn't the most natural of child actors -- some of his line readings are rather forced, and the story about the director threatening to shoot his dog in order to get him to cry in
The Champ sounds about right, even if it may be apocryphal. He wasn't in the same league as Freddie Bartholomew or Mickey Rooney, two of his contemporaries who were also at MGM, but he had an undeniable charm and charisma that could carry a picture.
An MGM publicity photo (circa 1935)
left to right: Freddie Bartholomew, Peggy Ryan, Mickey Rooney, Deanna Durbin, Judy Garland, Jackie Cooper
Ryan and Durbin both left for Universal when it became clear there wasn't enough room for both them and Judy Garland at MGM. Ryan stayed in mostly B-pictures. Durbin became a big star, but abandoned Hollywood at the top of her career in 1948. Garland we all know about. Like many child stars, Bartholomew's career fizzled when he reached adolescence. Rooney and Cooper both had lulls as they transitioned to adulthood. Cooper ended up as the most lastingly successful of the bunch, having a strong second-act as a director and character actor in the 1970s and '80s. Of the group pictured, only Rooney and Durbin are still alive.